javax.faces.render

Class RendererWrapper

java.lang.Object

javax.faces.render.Renderer

javax.faces.render.RendererWrapper

All Implemented Interfaces:

FacesWrapper<Renderer>

public abstract class RendererWrapper
extends Renderer
implements FacesWrapper<Renderer>

Provides a simple implementation of Renderer that can be subclassed by developers wishing to provide specialized behavior to an existing Renderer instance. The default implementation of all methods is to call through to the wrapped Renderer instance.

Usage: extend this class and push the implementation being wrapped to the constructor and use getWrapped() to access the instance being wrapped.

Since:

2.2

Field Summary

Fields inherited from class javax.faces.render.Renderer

PASSTHROUGH_RENDERER_LOCALNAME_KEY

Constructor Summary

Constructors

Constructor and Description
RendererWrapper() Deprecated. Use the other constructor taking the implementation being wrapped.
RendererWrapper(Renderer wrapped) If this renderer has been decorated, the implementation doing the decorating should push the implementation being wrapped to this constructor.

Method Summary

Modifier and Type	Method and Description
String	convertClientId(FacesContext context, String clientId) Convert the component generated client id to a form suitable for transmission to the client.
void	decode(FacesContext context, UIComponent component) Decode any new state of the specified UIComponent from the request contained in the specified FacesContext, and store that state on the UIComponent.
void	encodeBegin(FacesContext context, UIComponent component) Render the beginning specified UIComponent to the output stream or writer associated with the response we are creating.
void	encodeChildren(FacesContext context, UIComponent component) Render the child components of this UIComponent, following the rules described for encodeBegin() to acquire the appropriate value to be rendered.
void	encodeEnd(FacesContext context, UIComponent component) Render the ending of the current state of the specified UIComponent, following the rules described for encodeBegin() to acquire the appropriate value to be rendered.
Object	getConvertedValue(FacesContext context, UIComponent component, Object submittedValue) Attempt to convert previously stored state information into an object of the type required for this component (optionally using the registered Converter for this component, if there is one).
boolean	getRendersChildren() Return a flag indicating whether this Renderer is responsible for rendering the children the component it is asked to render.
Renderer	getWrapped() A class that implements this interface uses this method to return an instance of the class being wrapped.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

RendererWrapper

@Deprecated
public RendererWrapper()

Deprecated. Use the other constructor taking the implementation being wrapped.

RendererWrapper

public RendererWrapper(Renderer wrapped)

If this renderer has been decorated, the implementation doing the decorating should push the implementation being wrapped to this constructor. The getWrapped() will then return the implementation being wrapped.

Parameters:

wrapped - The implementation being wrapped.

Since:

2.3

Method Detail

getWrapped

public Renderer getWrapped()

Description copied from interface: FacesWrapper

A class that implements this interface uses this method to return an instance of the class being wrapped.

Specified by:

getWrapped in interface FacesWrapper<Renderer>

Returns:

the wrapped instance.

convertClientId

public String convertClientId(FacesContext context,
                              String clientId)

Description copied from class: Renderer

Convert the component generated client id to a form suitable for transmission to the client.

The default implementation returns the argument clientId unchanged.

Overrides:

convertClientId in class Renderer

Parameters:

context - FacesContext for the current request

clientId - the client identifier to be converted to client a specific format.

Returns:

the converted clientId

getConvertedValue

public Object getConvertedValue(FacesContext context,
                                UIComponent component,
                                Object submittedValue)
                         throws ConverterException

Description copied from class: Renderer

Attempt to convert previously stored state information into an object of the type required for this component (optionally using the registered Converter for this component, if there is one). If conversion is successful, the new value should be returned from this method; if not, a ConverterException should be thrown.

Overrides:

getConvertedValue in class Renderer

Parameters:

context - FacesContext for the request we are processing

component - UIComponent to be decoded.

submittedValue - a value stored on the component during decode.

Returns:

the converted value

Throws:

ConverterException - if the submitted value cannot be converted successfully.

decode

public void decode(FacesContext context,
                   UIComponent component)

Description copied from class: Renderer

Decode any new state of the specified UIComponent from the request contained in the specified FacesContext, and store that state on the UIComponent.

During decoding, events may be enqueued for later processing (by event listeners that have registered an interest), by calling queueEvent() on the associated UIComponent.

Overrides:

decode in class Renderer

Parameters:

context - FacesContext for the request we are processing

component - UIComponent to be decoded.

encodeBegin

public void encodeBegin(FacesContext context,
                        UIComponent component)
                 throws IOException

Description copied from class: Renderer

Render the beginning specified UIComponent to the output stream or writer associated with the response we are creating. If the conversion attempted in a previous call to getConvertedValue() for this component failed, the state information saved during execution of decode() should be used to reproduce the incorrect input.

Overrides:

encodeBegin in class Renderer

Parameters:

context - FacesContext for the request we are processing

component - UIComponent to be rendered

Throws:

IOException - if an input/output error occurs while rendering

encodeChildren

public void encodeChildren(FacesContext context,
                           UIComponent component)
                    throws IOException

Description copied from class: Renderer

Render the child components of this UIComponent, following the rules described for encodeBegin() to acquire the appropriate value to be rendered. This method will only be called if the rendersChildren property of this component is true.

Overrides:

encodeChildren in class Renderer

Parameters:

context - FacesContext for the response we are creating

component - UIComponent whose children are to be rendered

Throws:

IOException - if an input/output error occurs while rendering

encodeEnd

public void encodeEnd(FacesContext context,
                      UIComponent component)
               throws IOException

Description copied from class: Renderer

Render the ending of the current state of the specified UIComponent, following the rules described for encodeBegin() to acquire the appropriate value to be rendered.

Overrides:

encodeEnd in class Renderer

Parameters:

context - FacesContext for the response we are creating

component - UIComponent to be rendered

Throws:

IOException - if an input/output error occurs while rendering

getRendersChildren

public boolean getRendersChildren()

Description copied from class: Renderer

Return a flag indicating whether this Renderer is responsible for rendering the children the component it is asked to render. The default implementation returns false.

Overrides:

getRendersChildren in class Renderer

Returns:

the current value of the flag